Speed up log_execution_service_spec.rb

What does this MR do and why?

This MR speeds up spec/services/web_hooks/log_execution_service_spec.rb.

Locally this change reduces the time the specs take to run from 1 minute 46.53 seconds to 8.87 seconds.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.